MICHAEL BARONE: Eric Cantor was defeated for breaking one old rule and two newer ones.

The third lesson of Cantor’s defeat is that campaigning against “the entire crony corporate lobby” wins votes....

There's a strong case ... that crony capitalism violates the principles of both free-market conservatives and redistributionist liberals, as well as the principles of democratic fairness.

Republicans should keep that in mind, both is this year's midterms and in the runup to the 2016 election. The Tea Party will approve.